|
|
PDF LA8303JG Data sheet ( Hoja de datos )
| Número de pieza | LA8303JG | |
| Descripción | 2A/23V Step-Down LED Driver | |
| Fabricantes | Linear Artwork | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LA8303JG (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
|
No Preview Available !
LA8303
300KHz, 2A/23V Step-Down LED Driver
General Description
Features
LA8303 is a voltage mode, step-down LED
driver that is designed to meet maximum 2A
constant current for high power LED
application, and utilizes PWM control scheme
that switches with 300KHz fixed frequency.
The input voltage range of LA8303 is from 3.6V
to 23V. It is suitable for series-parallel 1W, 3W,
or 5W high power LED application due to the
high operation voltage and output capability.
At 12VIN, this device can drive up to 15pcs
(3S-5P) 1W LEDs. The 0.21V low feedback
voltage can reduce the power dissipation of the
constant current setting resistor, and improve
the conversion efficiency.
This device provides excellent regulation
during line or load transient. Other features of
external ON/OFF control, current limit, thermal
shutdown protection, and short circuit
protection are also included. It can also
operate with a maximum duty cycle of 100%
for use in low drop-out conditions. The
package is available in standard SOP-8.
l Up to 96% Efficiency
l 0.21V Low Feedback Voltage
l 3.6V to 23V Input Voltage Range
l Driving up to 15 LEDs (1W 3S-5P) at 12VIN
l 300KHz Oscillation Frequency
l Continuous 2A Output Capability
l 100% Duty Cycle
l 3mA Low Supply Current
l 1uA Low Shutdown Current
l PWM or Analog Dimming Control
l Built-in Low RDS(ON) Power MOSFET
l No External Compensation Required
l Adjustable Current Limit
l Short Circuit and Thermal Protection
l SOP-8 Package
l Meet RoHS Standard
Applications
l High Power LED Driver
l Backlight Applications
l General Lighting Solutions
l Constant Current Source
Ordering Information
LA8303 1 2 3 4
1 (Package Type) => J: SOP
2 (Number of Pins) => G: 8pin
3 (Output Voltage) => Blank: Adjustable
4 (Special Feature) => Blank: N/A
Available Part Number
LA8303JG
Marking Information
LA8303JG
1234
1 2 (Date Code)
For date code rule, please contact our sales
representative directly.
3 4 (Internal Code)
LA8303-C01
-1-
Jun. 11, 2009
1 page  
LA8303
Absolute Maximum Ratings
Parameter
Rating
Input Voltage
25V
SW Pin Voltage Range
-0.5V ~ VIN+0.5V
FB Pin Voltage Range
-0.3V ~ VIN
EN Pin Voltage Range
Storage Temperature Range
-0.3V ~ VIN+0.3V
-65°C ~ 150°C
Junction Temperature
150°C
Lead Soldering Temperature (10 sec)
300°C
These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for
prolonged time periods may affect device reliability. All voltages are with respect to ground.
Recommended Operating Conditions
Parameter
Rating
Input Voltage Range
3.6V ~ 23V
Ambient Temperature Range
-40oC ~ 85oC
Junction Temperature Range
-40oC ~ 125oC
These are conditions under which the device functions but the specifications might not be guaranteed. For
guaranteed specifications and test conditions, please see the Electrical Specifications.
Package Information
Parameter
Thermal Resistance
(Junction to Case)
Thermal Resistance
(Junction to Ambient)
Package
SOP-8
Symbol
θJC
θJA
Rating
20 oC/W
60 oC/W
LA8303-C01
-5-
Jun. 11, 2009
5 Page 
LA8303
Delay Start-up
The following circuit uses the EN pin to provide a time delay between the input voltage is applied
and the output voltage comes up. As the instant of the input voltage rises, the charging of
capacitor CDELAY pulls the EN pin low, keeping the device off. Once the capacitor voltage rises above
the EN pin threshold voltage, the device will start to operate. The start-up delay time can be
calculated by the following formula:
VIN
RDELAY
IN
EN GND
CDELAY
VEN
VIN x (1 – e-T/(RxC)) > VEN
Where T is the start-up delay time, R is RDELAY, C is CDELAY, and the typical VEN is 1.3V.
This feature is useful in situations where the input power source is limited in the amount of current
it can deliver. It allows the input voltage to rise to a higher voltage before the device starts
operating.
Snubber Circuit
The simple RC snubber is used for voltage transient and ringing suppression. The high frequency
ringing and voltage overshooting at the SW pin is caused by fast switching transition and
resonating circuit parasitical elements in the power circuit. It maybe generates EMI and interferes
with circuit performance. Reserve a snubber circuit in the PC board is preferred to damp the
ringing due to the parasitical capacitors and inductors of layout. The following circuit is a simple RC
snubber:
SW
FB
GND
C SN UB
RSNUB
VOUT
Choose the value of RC network by the following procedure:
(1) Measure the voltage ringing frequency (fR) of the SW pin.
(2) Find a small capacitor and place it across the SW pin and the GND pin to damp the ringing
frequency by half.
(3) The parasitical capacitance (CPAR) at the SW pin is 1/3 the value of the added capacitance
LA8303-C01
- 11 -
Jun. 11, 2009
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LA8303JG.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LA8303JG | 2A/23V Step-Down LED Driver | Linear Artwork |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |